Question

我用c ++创建了一个程序，用于删除c / c ++文件的提交，并将删除注释的版本放在另一个文件中。但是经过几个小时的调试后仍然无法正常工作。求救！

“input”是一个包含c / c ++文件的文件夹位置的字符串。 “files”是一个向量，文件夹中包含所有文件名，但不包含其位置。我使用“输入”和“文件”来获取文件名和位置。

for (unsigned int i = 0; i < files.size();i++ ){//for loop start

iteratora++;
string filename1 = input;
filename1.append("\\");
filename1.append(files[iteratora + 2]);

    cout << "\n" << filename1 << ".\n";
    cout << "Iterator: " << iteratora << ".\n";

programFile.clear();
ifstream afile (filename1);//(filename1);
fstream temp ("temp/temp.txt",std::ofstream::out | std::ofstream::trunc);

string line;//variable for holding the characters in one line

remove_comments(afile,temp);


if (temp.is_open())
{
    while ( getline (temp,line) )
    {
        //cout << line << '\n';
        if (line != ""){
            cout << line;
        programFile.push_back(line);
        line = "";
        }

    }
    temp.close();
}

temp.clear();



 if (showVerbose == true){
       print_vector(programFile);//used to know what is in the file
   }


}

删除评论功能

void remove_comments ( ifstream& Source , fstream& Target)
{
string line;
bool flag = false;


while ( ! Source.eof() ) // This loop is to get assure that the whole input file is read.
{


getline(Source, line); // To read line by line.

if ( flag )
{   if ( line.find("*/") < line.length() )
flag = false;
line.erase(0,line.find("*/") + 2);
}


if ( line.find("/*") < line.length() ) // searching for " /* " to eliminat it and all its content.
flag = true;
if ( ! flag )
{
for (int i = 0; i < line.length(); i++ )
{

if(i<line.length())
if ( ( line.at(i) == '/' ) && ( line.at(i + 1 ) == '/' ) ) // searching for " // " to eliminate all its content.
break;
else
Target << line[i]; // To copy lines in the output file.

}

Target<<endl;


}



}

Source.close(); // to close the opened files.
Target.close(); 
}

谢谢！

Answer 1

查找字符串的方法在不成功的搜索时返回std :: string :: npos，所以你应该写这行

if(line.find("/*") < line.length())

如下：

if(line.find("/*") != std::string::npos)

进行类似的更改并尝试。

Answer 2

这是另一种解决方案。它会打开file.txt并将整个文件加载到string。然后它删除了评论并将string中的新数据写回file.txt。

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main(void) {

        string source;
        ifstream readFile("file.txt");
        getline(readFile, source, '\0');    
        readFile.close();

        cout<<"\n---b e f o r e -----------------------------------\n\n";
         cout << source;

        while(source.find("/*") != string::npos) {
            size_t Beg = source.find("/*");
            source.erase(Beg, (source.find("*/", Beg) - Beg)+2);
        }

        while(source.find("//") != string::npos) {
            size_t Beg = source.find("//");
            source.erase(Beg, source.find("\n", Beg) - Beg);
        }   

       ofstream writefile("file.txt");
       writefile <<source;
       writefile.close();



       cout<<"\n\n-- a f t e r -------------------------------------------\n\n";


        cout << source;
        cout<<"\n---------------------------------------------\n\n";
        cout<<"\n\n";

    return 0;
}

用于删除C ++中的注释的程序不起作用

2 个答案: